This error happens when you try to stack arrays but the size of arrays along the concatenation axis don’t match. E.g.

You are watching: Valueerror: all the input array dimensions except for the concatenation axis must match exactly


Will provide the error as in the title. Due to the fact that np.vstack tries to ridge the 2 arrays vertically, i.e. Make the complying with output:


But you can still ridge a and also b horizontally through np.hstack, since both arrays have only one row. Because that the over a, b, np.hstack((a, b)) offers <<1,2,3,4,5>>.

numpy.vstack and numpy.hstack are special situations of np.concatenate, which join a succession of arrays follow me an existing axis. therefore in general, when using np.concatenate((a, b), axis=n), you need to make sure the shape of the 2 arrays are precisely the same other than along axis n. I.e. A.shape<:n> + a.shape == b.shape<:n> + b.shape, otherwise friend will obtain the error as in the title.

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Posted in UncategorizedTagged arrays, concatenate, hstack, numpy, python, vstack short article navigation
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